Over at personal finance blog Hello, Dollar! they've got a great post about how bringing your four times a week can eventually earn you half a million dollars. It also has the great potential side benefit of being more healthy!

Even if you don't make it to half a mil, it's a great tip that can save you some serious cash:

So let's see, four days bringing lunch at $2 plus one day out at $7 equals $15 per week. Eating out every day would cost $35 per week, so I save $20. $20 a week! That's over $80 a month — that covers my utility bills right there. Who couldn't use that?